JP5646425B2 - Electronics - Google Patents

Description

The present invention relates to an electronic device using wireless power transmission.

  As electronic devices become more mobile, there is a need for lighter power supplies. Conventionally, batteries such as lithium secondary batteries have been widely used as power sources for electronic devices such as mobile devices. However, in electronic devices that require a large amount of power, the weight of the battery increases and is acceptable. There was a problem in portability.

  Also, in an electronic device with a built-in battery, when charging the battery, a power connector is usually connected to transmit power, but there is a limit to downsizing the power connector. It has become a bottleneck for miniaturization. Furthermore, the design of the power connector differs depending on the model of the electronic device, and there was no versatility.

Accordingly, as a technique for supplying power to mobile devices without using a power connector, there is an interest in wireless power transmission technology. In this wireless power transmission technology, a power receiving unit made of a coil and a magnetic material is disposed in an electronic device casing, and power is transmitted by a power transmission unit such as a coil disposed in the vicinity of the electronic device casing.

JP 2010-239848

  In an electronic device having a conventional wireless power transmission device, there is a problem that power loss occurs because a magnetic material is used when a coil is built in the device.

An object of this embodiment is to provide an electronic device having a wireless power transmission device that can incorporate a coil in the device without using a magnetic material.

The electronic device according to the first embodiment includes a first housing containing electronic components, a first surface serving as a shared surface with the first housing, and a second surface having an angle with respect to the first surface. , And a second housing having a third surface having an angle with respect to the second surface, and a power transmission receiving coil (hereinafter referred to as a built-in part) facing each of the second surface and the third surface. The first surface is made of a conductor, and the conductor constituting the first surface compared to the equivalent conductivity of the electronic component built in the first housing Is characterized by a high electrical conductivity.
The electronic device according to the second embodiment includes a first housing containing electronic components, a first surface serving as a shared surface with the first housing, and a second surface having an angle with respect to the first surface. And a second housing having a third surface having an angle with respect to the second surface, and a power receiving coil incorporated in a portion facing each of the second surface and the third surface; And the first surface is made of an insulator.

The figure for demonstrating the wireless power transmission apparatus of Example 1. FIG. The figure explaining the modification of the coil for electric power transmission Configuration for explaining a wireless power transmission device according to a fourth embodiment The figure for demonstrating the modification of the conductor components which can be incorporated in a 2nd housing | casing Diagram for explaining circular spiral antenna Diagram for explaining a square spiral antenna The figure for demonstrating the power transmission coil containing a cable The figure for demonstrating the structure in the case of applying this invention to a printer. The figure for demonstrating the structure in the case of applying this invention to an air cleaner. The figure for demonstrating the structure in the case of applying this invention to a vacuum cleaner The figure for demonstrating the structure in the case of applying this invention to an electric vehicle The figure for demonstrating the modification by which an insulator is not incorporated in the 2nd housing | casing.

In the conventional wireless power transmission technology, as described above, the power receiving means including the coil and the magnetic material is disposed in the casing of the electronic device.
According to this technique, the shape of the magnetic lines of force changes by arranging the magnetic body in the vicinity of the coil. By changing the shape of the magnetic lines of force, the generation of eddy currents is suppressed when the conductor component is arranged in a place where the lines of magnetic force are reduced.
Since eddy currents cause energy loss, transmission efficiency can be increased if generation of eddy currents is suppressed. If the conventional technology is used in this way, when a coil is built in a device, wireless power can be efficiently generated if a magnetic material is arranged so as to reduce the lines of magnetic force to the place where there are conductor parts such as electronic components in the device. Transmission is possible.

  However, since the conventional wireless power transmission device uses a magnetic material, there is a problem that loss due to the magnetic material occurs. Moreover, the subject that the cost and weight of a magnetic body increase occurred. In particular, when a device with a built-in coil is a mobile device typified by a notebook computer or a mobile phone, or a mobile body typified by an electric vehicle, an electric motorcycle, or a bicycle with an electric assist, there is a significant problem that the weight increases. turn into.

  The electronic device according to the present embodiment has been made to solve the above-described conventional problems, and provides a wireless power transmission device that can incorporate a coil in the device without using a magnetic material that has been difficult in the past. The purpose is to do.

The electronic device according to this embodiment includes a first housing containing electronic components, a first surface serving as a shared surface with the first housing, a second surface having an angle with respect to the first surface, and A second housing having a third surface having an angle with respect to the second surface; and a power transmission coil built in a portion facing each of the second surface and the third surface. It is characterized by.
By using such a device, the shape of the magnetic lines of force is controlled by the power transmission coil, the coupling with the electronic component is reduced, and high-efficiency wireless power transmission is possible.

  In the electronic device of the embodiment, the first surface, the second surface, and the third surface of the second housing of the first housing are arranged so as to contact each other with an angle. The term “having” means that these surfaces are in contact with each other without forming a single plane. The most preferred embodiment is a state in which the two surfaces are in contact with each other at right angles.

The electronic device according to the present embodiment receives power by the magnetic lines formed by the power transmission coil disposed outside the casing of the electronic device, and the magnetic lines pass through the plurality of power transmission coils on the power receiving side. It is preferable to arrange a power transmission coil. For this purpose, the plurality of power transmission coils are arranged such that the centers of these coils are located on a circular arc corresponding to the magnetic field lines, and the magnetic field lines are orthogonal to each other in the vicinity of the center of the coil plane. desirable.

  In the electronic device according to the first embodiment, the first surface is made of a conductor, and the conductor constituting the first surface is compared with the equivalent conductivity of the electronic component built in the first housing. It is preferable to increase the conductivity. As a result, the magnetic force lines leaking toward the electronic component are further restricted on the first surface having a conductivity lower than that of the electronic component, and the coupling between the electronic component and the magnetic force line is reduced, so that the transmission is performed with high efficiency.

  In the electronic device according to the first embodiment, it is preferable that the first surface is made of an insulator. This makes it possible to reduce the loss due to the coupling between the common surface and the magnetic force lines when there are magnetic force lines leaking toward the electronic component.

Furthermore, in the electronic device of the embodiment, it is preferable that the second surface and the third surface are each formed of an insulator.
As a result, the lines of magnetic force pass through the second and third surfaces, but the loss due to this passage is reduced.

Furthermore, in the electronic device of the embodiment, it is preferable that the winding axis of the power transmission coil is perpendicular to the second surface and the third surface.
This makes it possible to widen the space inside the second housing.

Furthermore, in the electronic device of the embodiment, it is preferable to employ a conductor component having a resonance frequency different from the frequency transmitted or received by the power transmission coil as the conductor component arranged in the electronic device.
As a result, the number of components that can be built into the housing 2 increases, and the housing 1 can be downsized.

Furthermore, in the electronic device according to the embodiment, when the light is applied from an arbitrary angle, a conductor component whose shadow area formed on the projection plane is smaller than the area of the power transmission coil is applied to the second casing. It is preferable to incorporate it.
As a result, the number of components that can be built into the housing 2 increases, and the housing 1 can be downsized.

Furthermore, in the electronic device according to the above-described embodiment, it is preferable that a plurality of the conductor components are built in the second housing.
As a result, the number of components that can be built into the housing 2 is further increased, so that the housing 1 can be further miniaturized.

Furthermore, in the electronic device of the embodiment, it is preferable that the power transmission coil is a self-resonant coil.
As a result, the distance between the power transmission coils can be greatly increased, so that the degree of freedom in installing the coils is increased.

Furthermore, in the electronic device of the embodiment, it is preferable that one of the power transmission coils includes a cable connected to the electronic component built in the first housing.
Accordingly, since the power transmission coils are coupled to each other, only one of the coils needs to be connected to the electronic component having the power receiving circuit, and the cost of the electronic device can be reduced.

Furthermore, in the electronic device of the embodiment, it is preferable that one of the power transmission coils includes a cable connected to the conductor component built in the second casing.
Accordingly, since the power transmission coils are coupled to each other, only one of the coils needs to be connected to a conductor component having a power receiving circuit, and the cost of the electronic device can be reduced.

Furthermore, as an example of the electronic device of the embodiment, there is an apparatus applied to a handy printer apparatus in which roll paper is built in the second casing. This enables wireless power transmission to the handy printer.

  Hereinafter, the present embodiment will be described in detail with reference to the drawings.

Example 1
An electronic apparatus having a wireless power transmission device according to a first embodiment of the present invention will be described. The first embodiment targets a handy printer. As shown in FIG. 1, a first housing 103 containing an electronic component 101 and a printing component 102 and a second housing 105 containing a roll paper 104 are connected to each other. And the 2nd housing | casing has the 1st surface 106 used as a shared surface with a 1st housing | casing. Furthermore, it has the 2nd surface 107 which has an angle with respect to a 1st surface, and the 3rd surface 108 which has an angle with respect to a 2nd surface. And the power transmission coil 109 is built in the part which faces each of the second surface and the third surface. By configuring the handy printer in this way, when the power transmission coil is built in the handy printer, wireless power transmission can be performed with high efficiency without using a magnetic material.

  First, each part will be described, and then the effects of the present embodiment will be described.

  The first housing 103 contains the electronic component 101 and the print component 102. Here, the electronic component may be a battery for operating the printed component or a power supply circuit. Further, it may be a circuit board on which an electronic component having a function of receiving print data from a personal computer or the like and transmitting the received print data to the print component is mounted. Further, it may be a camera for acquiring print data, a barcode reader, or an RFID read / write device. Any electronic component. The print component is a component that includes a printer head, ink, or the like and has a function for printing.

  The second housing 105 contains a roll paper 104. This roll paper is used in the printed component of the first housing. Here, the roll paper may be only simple paper. Alternatively, it may be a paper on which characters or lines are printed in advance. Alternatively, it may be a seal and can be used as a seal after printing.

  The handy printer is configured by connecting the first housing 103 and the second housing 105, but has a first surface 106 at a shared portion when connected. And it has the 2nd surface 107 which has an angle with the 1st surface. Furthermore, it has the 3rd surface 108 which has an angle with respect to a 2nd surface. Each surface may have any shape.

  A power transmission coil 109 is incorporated in each of the portions facing the second surface and the third surface. The power transmission coil has a conductor wound in a coil shape. Here, the conductor may be composed of a single wire, a plurality of wires may be bundled, or a litz wire may be bundled with a plurality of insulated wires.

Moreover, the shape of the coil may be wound planarly or may be wound three-dimensionally. Moreover, the winding method which has arbitrary external shapes, such as circular, an ellipse, a rectangle, a hexagon, may be sufficient.
And the coil for electric power transmission is incorporated in the part which faces each of the 2nd surface and the 3rd surface.

  Next, the effect of the present embodiment will be described.

  Assume that the power transmission coil 110 is located below the handy printer as shown in FIG. Here, although not shown, a power transmission circuit such as a high frequency power source is connected to the power transmission coil. The high frequency energy output from the high frequency power source is input to the coil. When high frequency energy is input to the coil, a current flows through the coil, and lines of magnetic force are formed in the space by this current. FIG. 1 shows the magnetic field lines of this embodiment.

  In this embodiment, the magnetic field lines 111 generated by the power transmission coil pass through the power transmission coil built in the second surface and pass through the power transmission coil built in the third surface. And it returns to a power transmission coil. As described above, when magnetic lines of force are formed, current flows through the power transmission coil, and energy is transmitted. In this embodiment, power transmission is performed with magnetic lines of force as shown in FIG.

  Here, since the magnetic field lines are as shown in FIG. 1, it is possible to reduce the leakage of the magnetic field lines to the first housing containing the electronic component. As a result, power can be transmitted to a handy printer having electronic components without using a magnetic material. Further, the roll paper and the magnetic lines of force built in the second casing are in the same casing. However, in an insulator such as roll paper, the generation of eddy current is small, and the deterioration of transmission efficiency can be reduced.

As described above, in the handy printer in this embodiment, the shape of the magnetic lines of force can be controlled by incorporating the power transmission coils on the second and third surfaces of the second housing. Even without using a magnetic material, wireless power transmission can be performed with high efficiency.
In addition, a present Example is not restricted to the above, It is possible to apply to the various apparatus by which an insulator component is incorporated in a 2nd housing | casing.

(Example 2)
A handy printer having a wireless power transmission apparatus according to a second embodiment of the present invention will be described. In this embodiment, the first surface is made of a conductor. And the electrical conductivity of the conductor which comprises a 1st surface is large compared with the equivalent electrical conductivity of the electronic component incorporated in a 1st housing | casing, It is characterized by the above-mentioned. In this way, transmission efficiency can be increased.

  Here, as shown in FIG. 1, the case where a magnetic force line leaks to a 1st housing | casing without being restrict | limited to a 2nd housing | casing is considered. In this case, eddy currents are generated in the electronic components built in the first casing due to the magnetic field lines leaking to the first casing, and the transmission efficiency deteriorates. Therefore, the first surface, which is a common surface, is formed of a conductor. If the first surface is made of a conductor, the magnetic lines of force are blocked by the conductor, and loss in the electronic component built in the first housing is reduced.

However, since eddy current is generated on the first surface, the transmission efficiency deteriorates. In this embodiment, in order to reduce the loss due to the eddy current flowing in the first surface, the conductivity of the first surface is made larger than the equivalent conductivity of the electronic component built in the first housing. Here, the electronic components built in the first housing are all components built in the first housing. The equivalent conductivity means an averaged conductivity when parts having different conductivity are mixed.
When the amplitude of the eddy current flowing through the conductor is the same, the conductivity of the conductor is proportional to the loss. Therefore, in this embodiment, since the conductivity of the conductor through which the eddy current flows is large, the loss is small and high-efficiency wireless power transmission is possible.

  As described above, in the present embodiment, the first housing that is the common surface is formed of a conductor, and the conductivity of this conductor is made larger than the equivalent conductivity of the electronic component built in the first housing. Thus, the loss due to the magnetic field lines leaking to the first housing is improved, and highly efficient wireless power transmission is possible.

  The equivalent conductivity and the common surface conductivity can be compared as follows. First, all the electronic components built in the first housing are prepared. Next, wireless power transmission using a coil is performed, and the transmission efficiency is measured with an electronic component built in the first housing interposed therebetween. This efficiency is defined as η (electronic component). Next, the transmission efficiency is measured when a conductor having the same shape as the electronic component incorporated in the first housing and having the same type of conductor as the first surface is sandwiched between the coils. This efficiency is defined as η (conductor). If η (electronic component) <η (conductor), the conductivity of the conductor is higher than the equivalent conductivity of the electronic component.

Example 3
A handy printer having a wireless power transmission apparatus according to a third embodiment of the present invention will be described. In the present embodiment, the first surface is made of an insulator. In this way, transmission efficiency can be increased.

  Similar to the second embodiment, the lines of magnetic force may leak to the first housing. In this case, the eddy current generated on the first surface can be reduced by configuring the first surface with an insulator. As a result, energy loss is reduced, and highly efficient wireless power transmission becomes possible.

  Here, the insulator may be made of foamed polystyrene or plastic. Or you may comprise with air.

  As described above, in this embodiment, since the first surface is made of an insulator, eddy currents generated on the first surface by magnetic lines leaking to the first housing are reduced, and highly efficient wireless power transmission is possible. It becomes.

  Hereinafter, modifications of the power transmission coil will be described. FIG. 2 shows a power transmission coil 203 built in a portion facing the second surface 202. In this coil, the winding axis 201 of the coil is perpendicular to the second surface 202. By arranging the coils in this way, the internal space of the second housing can be increased. As a result, a larger roll paper can be built in the second housing.

Example 4
Embodiment 4 of the present invention will be described. As shown in FIG. 3, a conductor component 303 having a resonance frequency different from the frequency transmitted or received by the power transmission coil is incorporated in the second casing. Since such a conductor component can be placed in the second housing, the first housing can be miniaturized.

When there is a conductor part in the second casing, an eddy current flows through the conductor part and a loss occurs. This eddy current is most affected when the conductor component resonates at the wavelength of the radio wave. That is, there may be no problem in practice as long as the conductor is not a resonating conductor.
This is an example of a resonating conductor. For example, the length of a straight bar is a half wavelength. In the case of an integral multiple of a half wavelength. When it is a flat plate and the outer periphery of the plane has one wavelength. Also, when 1 wavelength + an integral multiple of 0.5 wavelength. Further, it may be a complicated shape. Here, the wavelength is a wavelength at a frequency used for transmission of wireless power transmission.

  As described above, such a conductor component can be incorporated in the second housing.

(Modification)
Hereinafter, modifications of the conductor component that can be incorporated in the second housing will be described. As shown in FIG. 4, when the light source 404 is used to shine light from an arbitrary angle, the conductor component 403 in which the area of the shadow 402 formed on the projection plane 401 is smaller than the area 406 of the power transmission coil 405 is provided. You may incorporate in 2 housings.

  Further, a plurality of conductor parts whose resonance frequency is different from the transmission frequency and conductor parts having an area smaller than the area of the power transmission coil may be combined and incorporated in a plurality of second housings. Thus, by incorporating many parts in the second casing, the number of parts to be incorporated in the first casing is reduced, and the first casing can be miniaturized.

  Hereinafter, modifications of the power transmission coil will be described. As shown in FIG. 5, a self-resonant coil having a circular spiral antenna 501 shape may be used. Alternatively, as shown in FIG. 6, a self-resonant coil having the shape of a square spiral antenna 601 may be used. By using such a self-resonant coil, it becomes possible to lengthen the transmission distance, and the degree of freedom of the installation place of the power transmission coil is improved.

  Further, as shown in FIG. 7, one of the power transmission coils 707 may include a cable 708 connected to the electronic component 701 built in the first housing 702. Since the power transmission coils are coupled to each other, only one of the coils needs to be connected to an electronic component having a power receiving circuit, and the cost of the electronic device can be reduced.

  Further, one of the power transmission coils may include a cable connected to a conductor component built in the second housing. Since the power transmission coils are coupled to each other, only one of the coils needs to be connected to a conductor component having a power receiving circuit, and the cost of the electronic device can be reduced.

  Hereinafter, modified examples of the first casing and the second casing will be described. FIG. 8 is an example of a printer. An electronic component 801 is built in the first housing 802, and paper 803 is stored in the second housing 804.

  FIG. 9 is an example of an air cleaner. An electronic component 901 is built in the first housing 902 and a filter 903 is built in the second housing 904.

  FIG. 10 is an example of a vacuum cleaner. An electronic component 1001 such as a motor is built in the first housing 1002, and the second housing 1003 is a dust collection unit into which dust such as dust or dirt enters.

  FIG. 11 is an example of an electric vehicle. An electronic component 1101 such as a motor is built in the first housing 1102. The body of this electric vehicle is made of resin and can transmit power to the built-in coil.

  FIG. 12 shows a configuration in the case where an insulator is not built in the second housing 1203. Thus, when nothing is built in, efficiency degradation is extremely small, and highly efficient wireless power transmission becomes possible.

  In the above description, the case where the electronic device receives power has been described, but conversely, the same can be applied to the case where the electronic device transmits power.

  The above invention can be used for applications other than wireless power transmission. For example, wireless communication can be performed by modulating a high frequency to be transmitted. In this case, wireless communication may be used as transmission / reception hardware.

  As described above, according to the various embodiments described above, in the wireless power transmission means, power loss due to the magnetic material is prevented, and further, the weight of the electronic device is reduced, the cost is reduced, the power is increased, the resonance frequency is controlled, the coil Thinning and the like can be realized.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

As mentioned above, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 101 ... Electronic component 102 ... Printed component 103 ... 1st housing | casing 104 ... Roll paper 105 ... 2nd housing | casing 106 ... 1st surface 107 ... 2nd surface 108 ... 3rd surface 109 ... Coil for electric power transmission 110 ... Power transmission coil 111 ... Magnetic field lines 201 ... Winding shaft 202 ... Second surface 203 ... Second surface 301 ... Electronic component 302 ... First housing 303 ... Conductor component 304 ... Second housing 305 ... First surface 306 ... Second surface 307 ... Third Surface 308 ... Coil for power transmission 401 ... Shadow projection plane 402 ... Shadow of conductor part 403 ... Conductor part 404 ... Light source 405 ... Coil for power transmission 406 ... Area of coil for power transmission 501 ... Circular planar spiral antenna 601 ... Square plane Spiral antenna 701 ... electronic component 702 ... first housing 703 ... second housing 704 ... first surface 705 ... second surface 706 ... third surface 707 ... electric power Coil for sending 801 ... Electronic component 802 ... First housing 803 ... Paper 804 ... Second housing 805 ... First surface 806 ... Second surface 807 ... Third surface 808 ... Coil for power transmission 901 ... Electronic component 902 ... First DESCRIPTION OF SYMBOLS 1 housing | casing 903 ... Filter 904 ... 2nd housing | casing 905 ... 1st surface 906 ... 2nd surface 907 ... 3rd surface 908 ... Coil for electric power transmission 1001 ... Electronic component 1002 ... 1st housing | casing 1003 ... 2nd housing | casing ( Garbage Collection Department)
DESCRIPTION OF SYMBOLS 1004 ... 1st surface 1005 ... 2nd surface 1006 ... 3rd surface 1007 ... Coil for electric power transmission 1101 ... Electronic component 1102 ... 1st housing | casing 1103 ... 2nd housing | casing 1104 ... 1st surface 1105 ... 2nd surface 1106 ... 1st Three surfaces 1107 ... Power transmission coil 1201 ... Electronic component 1202 ... First housing 1203 ... Second housing 1204 ... First surface 1205 ... Second surface 1206 ... Third surface 1207 ... Power transmission coil

Claims (11)

A first housing containing electronic components;
A second housing having a first surface serving as a common surface with the first housing, a second surface having an angle with respect to the first surface, and a third surface having an angle with respect to the second surface. When,
A power receiving coil built in a portion facing each of the second surface and the third surface ;
The electronic device is characterized in that the first surface is made of a conductor, and the conductivity of the conductor constituting the first surface is larger than the equivalent conductivity of the electronic component built in the first housing. A first housing containing electronic components;
A second housing having a first surface serving as a common surface with the first housing, a second surface having an angle with respect to the first surface, and a third surface having an angle with respect to the second surface. When,
A power receiving coil built in a portion facing each of the second surface and the third surface ;
The electronic device is characterized in that the first surface is made of an insulator. The electronic device according to claim 1, wherein the second surface and the third surface are each made of an insulator. 3. The electronic device according to claim 1 , wherein winding axes of the power transmission receiving coil are perpendicular to the second surface and the third surface, respectively. 3. The electronic device according to claim 1 , wherein a conductor component having a resonance frequency different from a frequency transmitted or received by the power transmission receiving coil is built in the second housing. 4. When light is applied from any angle, claims, characterized in that the area of the shadow that is formed on the projection plane incorporates a smaller conductor component than the area of the power transmission receiving coil in said second casing The electronic device according to claim 1 or 2 . The electronic device according to claim 6, wherein a plurality of the conductor parts are built in the second housing. The electronic device according to claim 1 , wherein the power transmission coil is a self-resonant coil. The electronic device according to claim 1, wherein one of the power transmission receiving coils includes a cable connected to the electronic component built in the first housing. The electronic device according to claim 5, wherein one of the power receiving coils for power transmission includes a cable connected to the conductor component built in the second casing. The handy printer apparatus according to claim 1, wherein a roll paper is built in the second casing.